The polluted water were covered with film and algae.

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Photo credit: © Chaiyaphong Kitphaephaisan / Alamy / Afripics
License: Royalty Free
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Keywords: algae, background, beauty, bubble, color, danger, detail, dirty, drainage, ecology, environment, environmental, film, green, gross, horizontal, industrial, landscape, leaf, light, natural, nature, organism, outdoors, park, pattern, plant, polluted, pollution, pond, river, sewage, summer, surface, swamp, texture, waste, water, wet